"Whitefly resistance to insecticides is a constant threat to successful management of
sticky cotton resulting from inadequate control of Bemisia whiteflies. A three-stage
resistance management program was implemented in Arizona cotton following a
severe whitefly resistance crisis in 1995. This program has been highly successful
for eight years. Success has been fostered by intensive investments into improved
whitefly sampling and treatment decisions, coupled with conservation of natural
enemies. This latter component has hinged on limited, strategic use of two insect
growth regulators in cotton, use of the neonicotinoid insecticide, imidacloprid, in
vegetables and melons, and tactical deployment of non-pyrethroid and pyrethroid
chemicals. Statewide monitoring of whitefly resistance to insecticides in cotton,
melons and greenhouse crops has permitted annual assessments of the status of
whitefly resistance management in Arizona. In this paper we summarize
susceptibility of whitefly collecions made in cotton in the 2002 and 2003 seasons and
discuss longer term trends in resistance development. No major problems regarding
field performance of insecticides against whiteflies were observed or reported in
2002 or 2003. However, monitoring confirmed the early stages of evolution of
resistance to pyriproxyfen (Knack®) and showed that whiteflies possessing this
resistance could be detected in all cotton-producing areas of the state. Susceptibility
to buprofezin (Applaud®/Courier®) has not changed significantly since 1997. Mean
susceptibility to synergized pyrethroids (e.g., Danitol® + Orthene®) has increased
strikingly on a statewide basis since 1995. However, 50 and 25% of cotton fields
sampled in 2002 and 2003, respectively, had resistance levels expected to result in
inadequate performance of synergized pyrethroid treatments. Whiteflies from
throughout Arizona were highly susceptible to imidacloprid (Admire®/Provado®)
and two other neonicotinoid insecticides, acetamiprid (Intruder®) and thiamethoxam
(Actara®/Centric®/Platinum®)."
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/215233 |
| Date | 09 1900 |
| Creators | Dennehy, Timothy J., DeGain, Benjamin A., Harpold, Virginia S., Brink, Sarah A. |
| Contributors | Byrne, David N., Baciewicz, Patti |
| Publisher | College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ) |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Article |
| Relation | Series P-139, AZ1348 |
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